b_sock.c

mediastreamer2是开源的网络传输媒体流的库

/* crypto/bio/b_sock.c */
/* Copyright (C) 1995-1998 Eric Young ([e-mail])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([e-mail]).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson ([e-mail]).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young ([e-mail])"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson ([e-mail])"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#define USE_SOCKETS
#include "cryptlib.h"
#include <openssl/bio.h>
#if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)
#include "netdb.h"
#endif

#ifndef OPENSSL_NO_SOCK

#ifdef OPENSSL_SYS_WIN16
#define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
#else
#define SOCKET_PROTOCOL IPPROTO_TCP
#endif

#ifdef SO_MAXCONN
#define MAX_LISTEN  SO_MAXCONN
#elif defined(SOMAXCONN)
#define MAX_LISTEN  SOMAXCONN
#else
#define MAX_LISTEN  32
#endif

#if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
static int wsa_init_done=0;
#endif

#if 0
static unsigned long BIO_ghbn_hits=0L;
static unsigned long BIO_ghbn_miss=0L;

#define GHBN_NUM	4
static struct ghbn_cache_st
	{
	char name[129];
	struct hostent *ent;
	unsigned long order;
	} ghbn_cache[GHBN_NUM];
#endif

static int get_ip(const char *str,unsigned char *ip);
#if 0
static void ghbn_free(struct hostent *a);
static struct hostent *ghbn_dup(struct hostent *a);
#endif
int BIO_get_host_ip(const char *str, unsigned char *ip)
	{
	int i;
	int err = 1;
	int locked = 0;
	struct hostent *he;

	i=get_ip(str,ip);
	if (i < 0)
		{
		BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
		goto err;
		}

	/* At this point, we have something that is most probably correct
	   in some way, so let's init the socket. */
	if (BIO_sock_init() != 1)
		return 0; /* don't generate another error code here */

	/* If the string actually contained an IP address, we need not do
	   anything more */
	if (i > 0) return(1);

	/* do a gethostbyname */
	CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
	locked = 1;
	he=BIO_gethostbyname(str);
	if (he == NULL)
		{
		BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
		goto err;
		}

	/* cast to short because of win16 winsock definition */
	if ((short)he->h_addrtype != AF_INET)
		{
		BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
		goto err;
		}
	for (i=0; i<4; i++)
		ip[i]=he->h_addr_list[0][i];
	err = 0;

 err:
	if (locked)
		CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
	if (err)
		{
		ERR_add_error_data(2,"host=",str);
		return 0;
		}
	else
		return 1;
	}

int BIO_get_port(const char *str, unsigned short *port_ptr)
	{
	int i;
	struct servent *s;

	if (str == NULL)
		{
		BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
		return(0);
		}
	i=atoi(str);
	if (i != 0)
		*port_ptr=(unsigned short)i;
	else
		{
		CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
		/* Note: under VMS with SOCKETSHR, it seems like the first
		 * parameter is 'char *', instead of 'const char *'
		 */
 		s=getservbyname(
#ifndef CONST_STRICT
		    (char *)
#endif
		    str,"tcp");
		if(s != NULL)
			*port_ptr=ntohs((unsigned short)s->s_port);
		CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
		if(s == NULL)
			{
			if (strcmp(str,"http") == 0)
				*port_ptr=80;
			else if (strcmp(str,"telnet") == 0)
				*port_ptr=23;
			else if (strcmp(str,"socks") == 0)
				*port_ptr=1080;
			else if (strcmp(str,"https") == 0)
				*port_ptr=443;
			else if (strcmp(str,"ssl") == 0)
				*port_ptr=443;
			else if (strcmp(str,"ftp") == 0)
				*port_ptr=21;
			else if (strcmp(str,"gopher") == 0)
				*port_ptr=70;
#if 0
			else if (strcmp(str,"wais") == 0)
				*port_ptr=21;
#endif
			else
				{
				SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
				ERR_add_error_data(3,"service='",str,"'");
				return(0);
				}
			}
		}
	return(1);
	}

int BIO_sock_error(int sock)
	{
	int j,i;
	int size;
		 
	size=sizeof(int);
	/* Note: under Windows the third parameter is of type (char *)
	 * whereas under other systems it is (void *) if you don't have
	 * a cast it will choke the compiler: if you do have a cast then
	 * you can either go for (char *) or (void *).
	 */
	i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
	if (i < 0)
		return(1);
	else
		return(j);
	}

#if 0
long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
	{
	int i;
	char **p;

	switch (cmd)
		{
	case BIO_GHBN_CTRL_HITS:
		return(BIO_ghbn_hits);
		/* break; */
	case BIO_GHBN_CTRL_MISSES:
		return(BIO_ghbn_miss);
		/* break; */
	case BIO_GHBN_CTRL_CACHE_SIZE:
		return(GHBN_NUM);
		/* break; */
	case BIO_GHBN_CTRL_GET_ENTRY:
		if ((iarg >= 0) && (iarg <GHBN_NUM) &&
			(ghbn_cache[iarg].order > 0))
			{
			p=(char **)parg;
			if (p == NULL) return(0);
			*p=ghbn_cache[iarg].name;
			ghbn_cache[iarg].name[128]='\0';
			return(1);
			}
		return(0);
		/* break; */
	case BIO_GHBN_CTRL_FLUSH:
		for (i=0; i<GHBN_NUM; i++)
			ghbn_cache[i].order=0;
		break;
	default:
		return(0);
		}
	return(1);
	}
#endif

#if 0
static struct hostent *ghbn_dup(struct hostent *a)
	{
	struct hostent *ret;
	int i,j;

	MemCheck_off();
	ret=(struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
	if (ret == NULL) return(NULL);
	memset(ret,0,sizeof(struct hostent));

	for (i=0; a->h_aliases[i] != NULL; i++)
		;
	i++;
	ret->h_aliases = (char **)OPENSSL_malloc(i*sizeof(char *));
	if (ret->h_aliases == NULL)
		goto err;
	memset(ret->h_aliases, 0, i*sizeof(char *));

	for (i=0; a->h_addr_list[i] != NULL; i++)
		;
	i++;
	ret->h_addr_list=(char **)OPENSSL_malloc(i*sizeof(char *));
	if (ret->h_addr_list == NULL)
		goto err;
	memset(ret->h_addr_list, 0, i*sizeof(char *));

	j=strlen(a->h_name)+1;
	if ((ret->h_name=OPENSSL_malloc(j)) == NULL) goto err;
	memcpy((char *)ret->h_name,a->h_name,j);
	for (i=0; a->h_aliases[i] != NULL; i++)
		{
		j=strlen(a->h_aliases[i])+1;
		if ((ret->h_aliases[i]=OPENSSL_malloc(j)) == NULL) goto err;
		memcpy(ret->h_aliases[i],a->h_aliases[i],j);
		}
	ret->h_length=a->h_length;
	ret->h_addrtype=a->h_addrtype;
	for (i=0; a->h_addr_list[i] != NULL; i++)
		{
		if ((ret->h_addr_list[i]=OPENSSL_malloc(a->h_length)) == NULL)
			goto err;
		memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
		}
	if (0)
		{
err:	
		if (ret != NULL)
			ghbn_free(ret);
		ret=NULL;
		}
	MemCheck_on();
	return(ret);
	}

static void ghbn_free(struct hostent *a)
	{
	int i;

	if(a == NULL)
	    return;

	if (a->h_aliases != NULL)
		{
		for (i=0; a->h_aliases[i] != NULL; i++)
			OPENSSL_free(a->h_aliases[i]);
		OPENSSL_free(a->h_aliases);
		}
	if (a->h_addr_list != NULL)
		{
		for (i=0; a->h_addr_list[i] != NULL; i++)
			OPENSSL_free(a->h_addr_list[i]);
		OPENSSL_free(a->h_addr_list);
		}
	if (a->h_name != NULL) OPENSSL_free(a->h_name);
	OPENSSL_free(a);
	}

#endif

struct hostent *BIO_gethostbyname(const char *name)
	{
#if 1
	/* Caching gethostbyname() results forever is wrong,
	 * so we have to let the true gethostbyname() worry about this */
	return gethostbyname(name);
#else
	struct hostent *ret;
	int i,lowi=0,j;
	unsigned long low= (unsigned long)-1;


#  if 0
	/* It doesn't make sense to use locking here: The function interface
	 * is not thread-safe, because threads can never be sure when
	 * some other thread destroys the data they were given a pointer to.
	 */
	CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
#  endif
	j=strlen(name);
	if (j < 128)
		{
		for (i=0; i<GHBN_NUM; i++)
			{
			if (low > ghbn_cache[i].order)
				{
				low=ghbn_cache[i].order;
				lowi=i;
				}
			if (ghbn_cache[i].order > 0)
				{
				if (strncmp(name,ghbn_cache[i].name,128) == 0)
					break;
				}
			}
		}
	else